Patent AU-2020201375-B2 (AU)
Title: Image prediction encoding device, image prediction encoding method, image prediction encoding program, image prediction decoding device, image prediction decoding method, and image prediction decoding program
Inventor: SUZUKI YOSHINORI
IPC: H04N19/55
Filed: 2020-02-25
Granted: 2020-12-17
Abstract: IMAGE PREDICTION ENCODING DEVICE, IMAGE PREDICTION 
ENCODING METHOD, IMAGE PREDICTION ENCODING PROGRAM, 
IMAGE PREDICTION DECODING DEVICE, IMAGE PREDICTION 
DECODING METHOD, AND IMAGE PREDICTION DECODING 
PROGRAM 
ABSTRACT 
Disclosed is an image predictive decoding method executed by an image predictive decoding 
device, comprising: a data analysis step of extracting encoded data of prediction information to 
indicate a prediction method to be used in prediction of a signal of a target region serving as a 
decoding target and encoded data of a residual signal, from compressed image data obtained by 
partitioning an image into a plurality of regions and encoding image data of the regions; 
prediction information decoding step of restoring motion information based on the encoded data 
of prediction information, wherein the image predictive decoding device restores a prediction 
block partitioning type indicating a number of prediction regions obtained by sub-partitioning 
the target region, based on the encoded data of prediction information, wherein, when the 
prediction block partitioning type indicates that the target region is vertically partitioned into a 
first prediction region on the left side and a second prediction region on the right side, the image 
predictive decoding device further decodes the encoded data of prediction information to restore 
a first merge identification information indicating whether or not to utilize candidates for motion 
information including decoded motion information associated with neighboring regions, except 
a neighboring region generated by intra-picture prediction, neighboring the first prediction 
region for generating a predicted signal of the first prediction region, wherein, when the first 
merge identification information indicates not to utilize the candidates for motion information, 
the image predictive decoding device further decodes the encoded data of prediction information 
to restore a first motion information utilized for generating the predicted signal of the first 
prediction region, wherein, when the first merge identification information indicates to utilize 
the candidates for motion information, the image predictive decoding device further decodes the 
encoded data of prediction information to restore a first selection information identifying the 
first motion information utilized for generating the predicted signal of the first prediction region 
based on the candidates for motion information and to restore the first motion information based 
on the first selection information, wherein, the image predictive decoding device further decodes
the encoded data of prediction information to restore a second merge identification information 
indicating whether or not to utilize decoded motion information associated with neighboring 
regions neighboring the second prediction region for generating a predicted signal of the second 
prediction region, wherein, when the second merge identification information indicates not to 
utilize the decoded motion information, the image predictive decoding device further decodes 
the encoded data of prediction information to restore a second motion information utilized for 
generating the predicted signal of the second prediction region, and wherein, when the second 
merge identification information indicates to utilize the decoded motion information and a 
plurality of candidates for the decoded motion information exist, the image predictive decoding 
device further decodes the encoded data of prediction information to restore a second selection 
information identifying the second motion information utilized for generating the predicted 
signal of the second prediction region based on candidate for the decoded motion information 
except the first motion information and motion information of a plurality of upper regions 
neighboring the second prediction region at an upper side of the second prediction region 
coinciding with the first motion information from among the decoded motion information 
associated with neighboring regions neighboring the second prediction region, and to restore the 
second motion information based on the second selection information; a storing step of storing 
motion information included in restored prediction information; a predicted signal generation 
step of generating a predicted signal of each of the first and second prediction regions in the 
target region based on the restored first motion information and the restored second motion 
information; a residual signal restoration step of restoring a reconstructed residual signal of the 
target region based on the encoded data of the residual signal; and a recording step of generating 
a restored pixel signal of the target region based on the predicted signal and the reconstructed 
residual signal and to store the restored pixel signal as the previously-reconstructed signal.